Roller for calendering machines



1,644 819 O 11 9 G. DOERR ROLLER FOR CALENDERING MACHINES Filed Jan. a; 1926 Fig.1.

INVENTOR WWW ATTORNEYS Patented a. 1' 1, 1927.

UNITED STATES PATENT OFFICE.

GEORG LUDWIG DOERR, OF MANNHEIM, GERmN'Y, ABSIGNOB-IO I. G. lAiBENINDUS- TRIE AK'IIENGESELLSCHAFT, OF FRANKFORT-ON-THE-MATN, GERIANY, A COR- nouns FOR cannnnnnmo macimms.

Application January This invention relates to a roller for calendering machines, which is particularly -useful for smoothing or glazing paper or textile websv and itprovldes means for obvi- ."i atingd'eflection at the central portion of the roller.

It is well-known, that rollers of this type are subjected to excessive stress, especially at the center where the greatest strain is 1 applied, and in order to'compensate for the deflection the rollers are gradually tapered 'ordslightly convexed from the center to the en s..

' An object of-the present invention, is to provide a straight non-tapered smoothing roller so that the applied pressure along the entire parallel line of contact between a pair of rollers, when revolving in engagement with each other, is obtained with uniform path cannot be accomplished with tapered feeding and smoothin of the web.

Another object of t e invention, is to rovide a resilient steel tube arranged on a s aft having an enlarged, central portion to sup port the tube, and meansfor widening the support. to accommodate webs of different widths.

The invention resides more particularly in the novel combinations hereinafter descrlbed and claimed, reference being made to the accompanying drawing in which Fig. 1 is represents a longitudinal section of a roller'embodying this invention.

Fig. 2 is a transverse section taken along the line 2 2 of the same.

Fig. 3 is a similar section taken along the line 3 3 of Fig. 1. v

In the drawing is shown a shaft havin an enlarged cylindrical central member 5 an members 6 of smaller diameter extending from each end of the center as indicated in Fig. 1. The shaft has end members 7 whereby it can be journaled or mounted in the.

frame of a calen-dering machine, with another roller of the same type adjacent to it, as is well-known. The enlarged the shaft carries a resilient steel tu e 8 which is rigidly fastened thereto by placing it ortion of s, 1928. Serial m. 79,065.

thereon when hot and allowing it to contract by coolin so as to sweat it to the shaft.

As indicated in the drawin about onethird of the tube is sup orte on the enlarged central member, w ile the other unsupported ortions projecting fronreach and form annu ar spaces or recesses 9 in conjunc-- t1on with the reduced ends of the shaft. If 56 greater or-smaller possible form changes of the steel tube are required for variable pressures it is efl'ected by insertin onto each end of, the reduced portions of t e shaft one or a number of steel rings 10 bearing against 60 the shoulders of the central enlargement.

In the use of very wide smoothing rollers, t is difficult to release the calender-s when nserting the web to be threaded, and securmg the desired smoothin action from the 66 start over the entire widt of the operating rollers, because the meeting facesof the rollers will invariably lightly press against the margins, of the web. In the case of two '7 rollers rotating together with straight parallel nfeeting surfaces, uniform smoothm 'of the web is obtained. over its entire surface under any pressure, because the elasticity or resiliency of the steel tube at its end controls the ressure equalization, and the change of orm at each endis regulated by the annular members screwed or otherwise .fixed to the reduced portions of the shaft.

Iclaim:-, 1. In a roller the combination with a shaft having a central member, ofa tube su ported on the central member of the sha and means for widening the central member of the shaft supporting the tube. a 2. In a roller the combination with a shaft having an enlarged member, of a tube supported on the member, and means for widening the member. g g

3. In a roller the combination with a shaft having a central member of eater diameter, of a tube su ported on oi: member, and 'means for wi ening the member;

4. In a roller the combination with a shaft Q il,644,819

having a central member of greater dienlarged member, and'rings fixed to the end 0 ameter, of a resilient tube supported on the members made to butt} against eachend of member, and means at both ends for widenthe central member for supporting more or ing the member to support more or less of less of the tube extending beyond the eentral i the tube. member.

5. In a roller the combination with a shaft In testimony whereof I have hereunto set including a central member havin an enmy hand. larged dlameter and end members 0 smaller diameter, of a resilient tube supported on the GEORG LUDWIG DOERR. 

